v3.26.1
Other intangible assets (Details)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2026
INR (₨)
Mar. 31, 2026
USD ($)
Mar. 31, 2025
INR (₨)
Disclosure of detailed information about intangible assets [line items]      
Beginning balance ₨ 96,803   ₨ 36,951
Impairment loss 406    
Ending balance 105,059 $ 1,120 96,803
Gross carrying amount [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 200,359   130,786
Additions 12,125   9,989
Assets acquired through business combinations 0   56,955
Disposals/De-recognitions (1,513)   (387)
Effect of changes in foreign exchange rates 16,363   3,016
Ending balance 227,334   200,359
Amortization/impairment loss [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 103,556   93,835
Amortization for the year 7,985   6,553
Impairment loss 2,164   1,689
Disposals/De-recognitions (302)   (75)
Effect of changes in foreign exchange rates 8,872   1,554
Ending balance 122,275   103,556
Product related intangibles [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 92,902   33,537
Ending balance 101,030   92,902
Product related intangibles [member] | Gross carrying amount [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 192,682   124,013
Additions 11,296   9,081
Assets acquired through business combinations 0   56,955
Disposals/De-recognitions (1,335)   (380)
Effect of changes in foreign exchange rates 16,323   3,013
Ending balance 218,992   192,682
Product related intangibles [member] | Amortization/impairment loss [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 99,780   90,476
Amortization for the year 7,448   6,146
Impairment loss 2,164   1,689
Disposals/De-recognitions (280)   (75)
Effect of changes in foreign exchange rates 8,848   1,544
Ending balance 117,962   99,780
Customer related intangibles [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 0   0
Ending balance 0   0
Customer related intangibles [member] | Gross carrying amount [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 109   106
Additions 0   0
Assets acquired through business combinations 0   0
Disposals/De-recognitions 0   0
Effect of changes in foreign exchange rates 20   3
Ending balance 129   109
Customer related intangibles [member] | Amortization/impairment loss [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 109   106
Amortization for the year 0   0
Impairment loss 0   0
Disposals/De-recognitions 0   0
Effect of changes in foreign exchange rates 20   3
Ending balance 129   109
Others [Member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 3,901   3,414
Ending balance 4,029   3,901
Others [Member] | Gross carrying amount [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 7,568   6,667
Additions 829   908
Assets acquired through business combinations 0   0
Disposals/De-recognitions (178)   (7)
Effect of changes in foreign exchange rates 20   0
Ending balance 8,213   7,568
Others [Member] | Amortization/impairment loss [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 3,667   3,253
Amortization for the year 537   407
Impairment loss 0   0
Disposals/De-recognitions (22)   0
Effect of changes in foreign exchange rates 4   7
Ending balance ₨ 4,184   ₨ 3,667